Betty White is one of the most beloved and talented entertainers in America, with a career spanning more than 80s years. Most of us love her work on shows like "The Mary Tyler Moore Show," "Golden Girls" and "Hot and Cleveland," but White is also a show biz pioneer and an avid animal welfare activist. As she celebrates her 97th birthday, we celebrate Betty White with a look at her life in photos.

Researchers found evidence that fasting affects circadian clocks in the liver and skeletal muscle, causing them to rewire their metabolism, which can ultimately lead to improved health and protection against aging-associated diseases.

Astronomers have revealed details of mysterious signals emanating from a distant galaxy, picked up by a telescope in Canada. The precise nature and origin of the blasts of radio waves is unknown. Among the 13 fast radio bursts, known as FRBs, was a very unusual repeating signal, coming from the same source about 1.5 billion light years away.

In 2019, more renewable energy will be added to the grid than fossil fuel-based energy, according to estimates from the Energy Information Administration (EIA). That had been the trend between 2013 and 2017, but last year new natural gas-fired power plants outpaced renewable additions to the grid. As a result, US carbon emissions increased, notably from the power sector, despite the rapid retirement of coal plants and a growing consciousness about the necessity of low-carbon energy.

One man has died from “traumatic” stab wounds after an incident at the Church of Scientology headquarters today. A teenager, 16, has been arrested after two men were allegedly stabbed in the driveway to the church in Sydney’s north at Chatswood, after he was asked to leave. Police said the teen was escorted from the premises and as he was taken down the road a 25cm “very sharp kitchen knife” was allegedly produced.

The letters began immediately. Dozens at first, then hundreds, each day bringing more: from a Texas man telling her this was why we needed to build the wall. From a New York television producer asking for an interview. From an elderly woman despairing “this divided America in which we now live.” Nearly every day since her daughter’s body was found, she had opened the mailbox, then sat and read them, because that was her routine, that was how she tried to make sense of something so senseless.

4Gamer has posted a series of end-of-year interviews with Japanese developers about their 2019 ambitions. Among them is Mega Man 11 producer Kazuhiro Tsuchiya, who has a few words to share about what's in store for the new year... Simply put, Tsuchiya is saying that 2019 will be spent preparing for the next game in the franchise. Although we probably won't see a major release in 2019, we can rest easy with the knowledge that something new is on the burner. As to what the next game migh...